Coolant Overflow Tanks & Expansion Catch Cans

What does a radiator expansion tank do?

A radiator expansion tank, also known as a coolant overflow tank, serves a vital role in the cooling system of your vehicle. It functions to collect and store excess coolant that expands as the engine heats up during operation. When the engine cools down, the stored coolant is drawn back into the radiator to maintain the proper coolant level. This process helps prevent coolant loss and air bubbles in the cooling system, ensuring efficient cooling and preventing overheating.

Do you fill the radiator or expansion tank?

In a properly functioning cooling system, you should not need to fill the radiator directly. Instead, you should fill the radiator expansion tank with the appropriate coolant mixture. As the engine heats up and coolant expands, excess coolant flows into the expansion tank. When the engine cools down, it draws coolant back from the expansion tank to maintain the radiator's proper coolant level. It's essential to monitor and maintain the coolant level in the expansion tank to ensure efficient cooling and prevent overheating.

How much does a radiator expansion tank cost?

The cost of a radiator expansion tank can vary depending on factors such as the brand, design, and specific vehicle fitment. At JEGS, we offer a range of options to fit various budgets. Basic expansion tanks can start at around $20 to $40, while more advanced and specialized designs may range from $40 to $100 or more. Investing in a quality expansion tank is essential for maintaining the proper functioning of your vehicle's cooling system and preventing overheating.